High side V-I converter reference design from 0 V to 2 V and 0 mA to 100 mA, 1% full-scale error


Design files


This verified design delivers a well-regulated current to a ground-referenced load that could be used for actuators, sensors, motors, and many other applications. The design utilizes a two-stage approach to allow the high-side current source to accept a ground-referenced input. The first stage uses an op amp and n-channel MOSFET to translate the ground-referenced input to a supply-referenced signal. The supply-referenced signal drives the second stage op amp that controls the gate of a p-channel MOSFET to regulate the load current. The OPA2333 is used for both stages of the design because of the low quiescent current, rail-to-rail input/output, and zero-drift chopper technology. The rail-to-rail input stage includes voltages that exceed both supply rails so there is no loss or "dead-zone" when used as a low-side sink for the first stage or as a high-side source for the second stage. The rail-to-rail output ensures that the op amp is able to successfully turn off the active devices ensuring low zero-scale currents. The zero-drift architecture allows for precision DC performance over temperature.

  • Converts Voltage to current: 0 to 2 V, 0 mA to 100 mA
  • Less than 0.1 % Error
  • Single-supply solution with rail-to-rail input dual-channel op amp
  • Good compliance voltage to the both rails
  • Design creates a current source that allows for a GND referenced load
  • Excellent DC performance and temperature drift using zero-drift OPA2333 op amp

      This Verified Design Includes:

    • Theory
    • Component Selection
    • TINA-TI Simulation
    • Schematics and PCB Layout
    • Verification and Measured Performance
    • Modification Options

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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

SLAC573.ZIP (853 K)

Detailed schematic diagram for design layout and components

TIDR177.PDF (96 K)

Detailed schematic diagram for design layout and components

TIDR205.PDF (66 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC140.ZIP (399 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Precision op amps (Vos<1mV)

OPA23331.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* User guide TIPD102 Verified Design Reference Guide Sep. 19, 2013

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TINA-TI SPICE-based analog simulation program

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